Re^3: regex in REPLACEMENT in s///

you only need parentheses when there's a capture

Are they not also needed where there is optionality?

Could this be (sensibly) rewritten without the parenthesis?

$example =~ s/hiss(es)?/leak/;
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To substitute hiss/hisses for leak but not substitute hisse or hisss.

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Re^4: regex in REPLACEMENT in s/// by haukex (Archbishop) on Sep 13, 2023 at 06:37 UTC
Could this be (sensibly) rewritten without the parenthesis? `$example =~ s/hiss(es)?/leak/;` Although tybalt89 probably can think of some ways, my answer would be: No, I would keep the parentheses in that case. However, they can be made non-capturing by writing `/hiss(?:es)?/` (or with the `/n` modifier, new since 5.22). I think choroba's point was that in `s/(\d)/3/g`, the parens serve no purpose at all.	[reply] [d/l] [select]
Re^5: regex in REPLACEMENT in s/// by Bod (Parson) on Sep 13, 2023 at 10:42 UTC
Although tybalt89 probably can think of some ways, my answer would be: No I am sure that tybalt89 and other wizards in The Monastery could contrive something that would have the same functionality...that's why I added "sensibly" to my question! Thanks for clarifying - I thought that was the case but I am far from being a regexp wizard so I wanted to check. Now I need to go and look up the `/n` modifier as that is new to me. I need to look up others as well as the only ones I ever use are `/igc` I think although I feel there is at least one more I use occasionally!	[reply] [d/l] [select]